To your point, at one of the earliest SBEs, Barry Szamboti, Bill Schick, Richard Black, et al., hosted booths and had cues for sale. Those were the days before their waiting lists either got too long or ceased to exist. At a recent SBE, Pete Tonkin showed up with cues to sell. While not on your original list, he probably should be.
My question is why a cuemaker should travel then fund and staff a booth to sell a few cues if their waiting lists are already so long that they would not consider taking additional orders. The lists for the guys you mentioned are not 4 years. I see a potential benefit for collectors and flippers, but little benefit for the cuemakers or for those of us who just want one of these cues at a reasonable price for playing pool.
I believe someone tried to do exactly what you suggested for a cue show a couple of years ago. He engaged one of the cuemakers on your list to build 5 cues for a show. IIRC, the cuemaker did not travel to the show and never built the cues. Some of these guys are a hard to count on.
This seems more like a discussion for Ask The Cuemaker. The rest of us are not holding your idea back. I am pretty sure that if you build it, they will come.
Many of us have our pet peeves, this is mine. I have a hard time understanding why cuemakers work so hard making these beautiful cues just to have them sold for quick profit or sit in cases and be taken out once in a while to be pictured with 100+ other cues on a pool table. Making cues for a cue show serves the collector/flipper crowd. But I would have thought that having people play with their cues would be the ultimate compliment for their skills. Silly me.